staging: rtl8821ae: deal with unused functions in halbtc8723b2ant.c

This commit fixes the compiler -Wunused-function warning. It was enough
to put #define around them to supress this warning. One was a special
case because it's usage was commented-out therefore, as I did not want
to remove it completely, I disabled it with #if 0

Conditionally compiled symbols

    halbtc8723b2ant_monitor_bt_enable_disable
    halbtc8723b2ant_set_bt_auto_report
    halbtc8723b2ant_bt_auto_report

Disabled symbols

    halbtc8723b2ant_adc_backoff
    halbtc8723b2ant_set_adc_backoff

Signed-off-by: Konrad Zapalowicz <bergo.torino@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8821ae/btcoexist/halbtc8723b2ant.c

@@ -247,6 +247,7 @@ static u8 halbtc8723b2ant_wifi_rssi_state(struct btc_coexist *btcoexist,
 	return wifi_rssi_state;
 }
 
+#if (BT_AUTO_REPORT_ONLY_8723B_2ANT == 0)
 static void halbtc8723b2ant_monitor_bt_enable_disable(
 						struct btc_coexist *btcoexist)
 {
@@ -300,6 +301,7 @@ static void halbtc8723b2ant_monitor_bt_enable_disable(
 		}
 	}
 }
+#endif
 
 static void halbtc8723b2ant_monitor_bt_ctr(struct btc_coexist *btcoexist)
 {
@@ -734,6 +736,7 @@ static void halbtc8723b2ant_dec_bt_pwr(struct btc_coexist *btcoexist,
 	coex_dm->pre_dec_bt_pwr = coex_dm->cur_dec_bt_pwr;
 }
 
+#if (BT_AUTO_REPORT_ONLY_8723B_2ANT == 0)
 static void halbtc8723b2ant_set_bt_auto_report(struct btc_coexist *btcoexist,
 					bool enable_auto_report)
 {
@@ -775,6 +778,7 @@ static void halbtc8723b2ant_bt_auto_report(struct btc_coexist *btcoexist,
 
 	coex_dm->pre_bt_auto_report = coex_dm->cur_bt_auto_report;
 }
+#endif
 
 static void halbtc8723b2ant_fw_dac_swing_lvl(struct btc_coexist *btcoexist,
 				      bool force_exec, u8 fw_dac_swing_lvl)
@@ -950,6 +954,7 @@ static void halbtc8723b2ant_dac_swing(struct btc_coexist *btcoexist,
 	coex_dm->pre_dac_swing_lvl = coex_dm->cur_dac_swing_lvl;
 }
 
+#if 0
 static void halbtc8723b2ant_set_adc_backoff(struct btc_coexist *btcoexist,
 				     bool adc_backoff)
 {
@@ -985,6 +990,7 @@ static void halbtc8723b2ant_adc_backoff(struct btc_coexist *btcoexist,
 
 	coex_dm->pre_adc_back_off = coex_dm->cur_adc_back_off;
 }
+#endif
 
 static void halbtc8723b2ant_set_agc_table(struct btc_coexist *btcoexist,
 				   bool agc_table_en)